Quantitative Calculation of Critical Depth in Typical Rockburst Mine

Abstract

In order to calculate the critical depth of a typical rockburst coal mine quantitatively, which is helpful in rockburst prevention and control, in this paper, the concept of typical rockburst coal mine and atypical rockburst coal mine is put forward, energy characteristics of a coal-rock dynamic system is identified, and the relationship between rockburst and the coal-rock dynamic system is analysed by the model of the coal-rock dynamic system. Energy characteristics of the coal-rock dynamic system in the gravity stress field, tectonic stress field, and mining stress field are determined, respectively, and corresponding calculation methods are put forward at the same time, and the calculation method of the coal-rock dynamic system energy can forecast the occurrence of rockburst, with an accuracy of 80%. The calculation method of the critical depth in a typical rockburst coal mine is put forward, and the accuracy of which is validated in one typical rockburst coal mine. The degree of coincidence for the result of this method is 93.1%, which shows that the calculation method of a critical depth in a typical rockburst mine is highly reliable and practical, which could be widely used in forecasting the hazard of rockburst in typical rockburst mines. This method will be validated in more coal mines, and the calculation method of the critical depth in an atypical rockburst mine will be further researched in the future.